Abstract
A test technique which gives a quantitative measure of the in situ fibre/matrix bond strength in fibre-reinforced composite materials is described. The test involves the compressive loading of a fibre or region of fibres on a polished specimen surface to produce debonding. Results are presented for the debonding load for glass/epoxy, aramid/epoxy and graphite/epoxy composites. The change in debonding load is also followed as the interface degrades during moisture conditioning at different points through the thickness of the material. It is concluded that refinements to the technique are needed to simplify interpretation of the debonding force in terms of interface shear strength, and to make the test more reproducible.
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